Clash Subscription Management: Troubleshooting Update Failures, Auth, and Health Checks

What a Subscription Actually Is, and Where to Look When It Breaks

What we usually call "importing a subscription" actually maps to the proxy-providers field at the config-file level: the client periodically hits a URL, pulls down the node list it returns, parses it into nodes, and drops them into the corresponding policy group. Once you understand this layer, you'll know exactly where to look when a subscription "fails to update."

proxy-providers:
  my-sub:
    type: http
    url: "https://example.com/sub?token=xxx"
    interval: 3600       # Auto-updates every 3600 seconds
    health-check:
      enable: true
      url: https://www.gstatic.com/generate_204
      interval: 300

Most graphical clients hide this entire block of config behind the "Import Subscription" input field — the link you type in is the url field, and the "update interval" in the UI maps to interval. There's no fundamental difference under the hood.

Common Reasons Subscription Updates Fail

• Flagged as an "abnormal client" and denied accessSome subscription services check the request's User-Agent and block requests from uncommon clients. You can manually set a common UA string in the header field to disguise the request.
• The subscription link requires authenticationIf the subscription URL needs an Authorization header to be accessible (common with self-hosted panel subscription endpoints), attach it the same way through the header field, rather than embedding the token in the URL (some services support both, but using a header is the cleaner approach).
• Fetching the subscription itself needs to go through the proxyIf the subscription server is overseas, and reaching overseas sites on your network requires having a working node first, you end up in a deadlock: no working node means the subscription can't be fetched, and the subscription failing to fetch means there's no node. In that case, you can use the proxy field to specify a fixed bootstrap node used solely for updating the subscription.
• The subscription file exceeds a size limitThe size-limit field has no limit by default, but if the client or panel has set a more conservative limit on its own, an oversized subscription file will simply be rejected — you can raise or remove that limit.

proxy-providers:
  my-sub:
    type: http
    url: "https://example.com/sub"
    proxy: Direct Bootstrap Node    # Fixed egress used only for updating the subscription
    header:
      User-Agent:
        - clash-verge/v2.0.0
      Authorization:
        - Bearer your-token-here

Using health-check to Weed Out Dead Nodes

Over time, subscription nodes go offline, get throttled, or get blocked — that's just normal. Without health checks, your policy group ends up full of unreachable "zombie nodes," which makes auto speed-testing and auto-selection a bad experience. That's exactly what health-check is for:

Add a health-check block under the relevant proxy-providers entry, pointing to a stable test URL (https://www.gstatic.com/generate_204 or https://cp.cloudflare.com are recommended). The client will send a test request to every node at the interval you set.

• enable: whether health checking is on — it's recommended to always keep this enabled.
• interval: check interval in seconds. It doesn't need to be too short — 300–600 seconds is plenty.
• lazy: defaults to true, meaning nodes that aren't actually in use won't be checked, saving resources. If you want the dashboard to always show up-to-date latency numbers, you can turn this off, at the cost of a bit more background traffic.

Too Many, Too Messy Nodes? Trim Them Down with filter

Some subscriptions hand you a few hundred nodes at once, and dumping them all into one policy group makes it hard to pick and messy to look at. filter / exclude-filter let you match or exclude nodes by keyword or regex, splitting nodes by region or purpose into separate policy groups.

proxy-providers:
  hk-only:
    type: http
    url: "https://example.com/sub"
    filter: "(?i)港|hk|hongkong"
  no-relay:
    type: http
    url: "https://example.com/sub"
    exclude-filter: "(?i)中转|relay"

The same subscription URL can be configured as multiple proxy-providers entries, each with a different filter to split out subsets like "Hong Kong only," "Japan only," or "exclude relays," then give each its own policy group — much easier than scrolling through one giant list of a few hundred nodes.

FAQ